US Bridges

I-180 over Illinois River

Fair

Bureau County, Illinois · 1.82 MI E of Ill 26 · Structure no. 078000100000000

Built
1969
56 years old, rebuilt 2023
Condition
Fair
inspected November 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
3,083 ft
3 main spans
Daily traffic
2,900
2023 count
Owner
State
State Highway Agency

About this bridge

I-180 over Illinois River is a steel continuous stringer/multi-beam or girder carrying I-180 over Illinois River in Bureau County, Illinois. It was built in 1969 and reconstructed in 2023, so it is 56 years old, older than the Illinois average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 2,900 vehicles a day, roughly 27% of them trucks, projected to reach 2,340 by 2046. The structure is 3,083 ft (939.8 m) long and 65 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesI-180
CrossesIllinois River
Location1.82 MI E of Ill 26
RouteInterstate 180
CountyBureau County
StateIllinois
Coordinates41.26218, -89.35365
Functional classRural Principal Arterial - Interstate

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating60.4 US tons
Inventory rating36 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3 (+12 approach)
Design loadHS 20 + Mod
Structure length3,083 ft (939.8 m)
Longest span375 ft (114.3 m)
Deck width65 ft (19.8 m)
Roadway width59 ft (18.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,900 (2023)
Projected traffic2,340 by 2046
Trucks27%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was I-180 over Illinois River built?

It was built in 1969, making it 56 years old in 2025. It was reconstructed in 2023.

What condition is I-180 over Illinois River in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in November 2023.

How much traffic does I-180 over Illinois River carry?

About 2,900 vehicles per day (2023 count), of which roughly 27% are trucks.

How long is I-180 over Illinois River?

The structure is 3,083 ft (939.8 m) long with a longest span of 375 ft (114.3 m) and a deck 65 ft wide.

Who owns I-180 over Illinois River?

It is owned by the State Highway Agency.